All Test Was Repaired

StructureHelperCommon/Models/Forces/DesignForceTuple.cs

@@ -2,6 +2,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Runtime.Remoting.Messaging;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -19,5 +20,12 @@ namespace StructureHelperCommon.Models.Forces
             CalcTerm = calcTerm;
             ForceTuple = new ForceTuple();
         }
+
+        public object Clone()
+        {
+            var newTuple = new DesignForceTuple(this.LimitState, this.CalcTerm);
+            newTuple.ForceTuple = this.ForceTuple.Clone() as IForceTuple;
+            return newTuple;
+        }
     }
 }